Phosphate extraction can be used successfully and relatively inexpensive to lower phosphate levels on former agricultural soils , according to research from the Louis Bolk Institute (sustainable agriculture and nature). The study in which this has occurred is tested on sandy soils with many available phosphate (no iron-rich seepage), where continiously phosphate extraction with potassium fertilization was compared with mowing simultaneously (4-5 cuts per year) without fertilization. To illustrate the results of a plot in the 'Hengstven' part of in the region 'Loonse and Drunense Duinen'.